linux-kernel - Re: [PATCH net-next 2/3] mptcp: fallback to TCP after SYN+MPC drops

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Message-ID: <CANn89i+6yPqdEsf7gEWSys0ibYwq7CLm70ikC5F2Rahync4yOg@mail.gmail.com>
Date: Wed, 11 Sep 2024 09:40:49 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>, 
	Geliang Tang <geliang@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, 
	Jonathan Corbet <corbet@....net>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] mptcp: fallback to TCP after SYN+MPC drops

On Mon, Sep 9, 2024 at 10:10 PM Matthieu Baerts (NGI0)
<matttbe@...nel.org> wrote:
>
> Some middleboxes might be nasty with MPTCP, and decide to drop packets
> with MPTCP options, instead of just dropping the MPTCP options (or
> letting them pass...).
>
> In this case, it sounds better to fallback to "plain" TCP after 2
> retransmissions, and try again.
>
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/477
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>